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KIT – University of the State of Baden-Wuerttemberg and National
Research Center of the Helmholtz Association
1KIT, Karlsuhe; 2CNRS / Meteo France; 3LEGOS / OMP
www.kit.edu
Intercomparison of AROME and COSMO simulations for a period of
the AMMA campaignVera Maurer1, Florent Beucher2, Jean-Philippe
Lafore2, Francoise Guichard2, Jeremie Aublanc3, Remy Roca3
VorführenderPräsentationsnotizen- hier bereits erklären, wieso
Westafrika extrem hoher Anteil konvektiver Niederschläge, große
Systeme
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IMK-TRO, KIT (Karlsruhe)2
General comparison of model components
AROME COSMOparameterizations
turbulence scheme
prognostic TKE, comp. of exchange-coeff. (Cuxart et al.,
2000)
TKE-based level 2.5 turbulence closure after Mellor and Yamada
(1982)
shallow convection
Eddy diffusion / Kain Fritsch (EDKF)
shallow convection from Tiedtke mass-flux scheme
radiation two-stream approximation (RRTM scheme from IFS)
radiative transfer after Ritter and Geleyn (1992)
microphysics mixed-phase bulk scheme cloud-ice bulk scheme
including graupel
soil model ISBA (3 layers) Terra-ML (8 layers)
25.06.2013 Maurer et al.: Intercomparison of AROME and COSMO
simulations for a period of the AMMA campaign
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IMK-TRO, KIT (Karlsruhe)3
General comparison of model components
AROME COSMO
numerics spectral limited-area model rotated geographical
lat/lon grid
semi-implicit, semi- Lagrangian timestep
3rd order two time-level Runge- Kutta split-explicit scheme
(Wicker and Skamarock, 2002)
Arakawa A-gridterrain-following hybrid mass coordinates
Arakawa C-gridterrain-following hybrid height- based
coordinate
model setup model version 4.18
initial and bound- ary conditions
Arpège analysis using AMSU-B microwave data
ECMWF AMMA re-analysis (6- hourly resolution)
nominal res. of 0.05° 0.025°
25.06.2013 Maurer et al.: Intercomparison of AROME and COSMO
simulations for a period of the AMMA campaign
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IMK-TRO, KIT (Karlsruhe)4
differences of total precipitable water
25.06.2013
Arpège – ECMWF reanalyes, 6-day mean
time
15°W 2°E 20°E
AROME – COSMO simulation,average over 12-20°N
Maurer et al.: Intercomparison of AROME and COSMO simulations
for a period of the AMMA campaign
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IMK-TRO, KIT (Karlsruhe)5
anomaly of precipitable water with respect to 6-day period,
averaged over 12-20°N
25.06.2013
23/07
25/07
27/07
29/0715°W 2°E 20°E
AROME COSMO
Maurer et al.: Intercomparison of AROME and COSMO simulations
for a period of the AMMA campaign
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IMK-TRO, KIT (Karlsruhe)6
precipitation 5-day mean
25.06.2013
average 8°W to 6°E
Maurer et al.: Intercomparison of AROME and COSMO simulations
for a period of the AMMA campaign
AROME COSMO
TMPA V7
IFS
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IMK-TRO, KIT (Karlsruhe)7
MCS tracking – definition of “blobs”
Maurer et al.: Intercomparison of AROME and COSMO simulations
for a period of the AMMA campaign
25.06.2013
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IMK-TRO, KIT (Karlsruhe)8
MCS tracking 25/07 and 26/07
Maurer et al.: Intercomparison of AROME and COSMO simulations
for a period of the AMMA campaign
25.06.2013
MCS tracks derived from GSMAPprecipitation product
tracks derived fromAROME hourly precip- itation data
interpolatedto 0.1°
tracks derived fromCOSMO hourly precip- itation data
interpolatedto 0.1°
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IMK-TRO, KIT (Karlsruhe)9
MCS tracking - statistics
25.06.2013
initiation
max. area of precipitation patterns
first occur- rence of pre- cipitation
lifetimemean total pre- cipitation of systems with same area
Maurer et al.: Intercomparison of AROME and COSMO simulations
for a period of the AMMA campaign
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IMK-TRO, KIT (Karlsruhe)10
MCS tracking – statistics (2)
25.06.2013 Maurer et al.: Intercomparison of AROME and COSMO
simulations for a period of the AMMA campaign
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IMK-TRO, KIT (Karlsruhe)11
boundary layer - vertical profiles at 12 UTC
Maurer et al.: Intercomparison of AROME and COSMO simulations
for a period of the AMMA campaign
25.06.2013
AROME COSMO radio soundings
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IMK-TRO, KIT (Karlsruhe)12
distribution of boundary-layer heights
Maurer et al.: Intercomparison of AROME and COSMO simulations
for a period of the AMMA campaign
25.06.2013
AROME COSMO
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IMK-TRO, KIT (Karlsruhe)13
comparison of boundary-layer characterisics
Maurer et al.: Intercomparison of AROME and COSMO simulations
for a period of the AMMA campaign
25.06.2013
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IMK-TRO, KIT (Karlsruhe)14
surface layer – humidity and potential temperature
Maurer et al.: Intercomparison of AROME and COSMO simulations
for a period of the AMMA campaign
25.06.2013
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IMK-TRO, KIT (Karlsruhe)15
Conclusions
intercomparison of two simulations with similar setup but
different initial and boundary conditionsdisplacement of convective
activity towards the south by AROME and towards north by COSMOdaily
cycle of convective systems for both simulations in accordance with
precipitation productmaximum surface of systems underestimated,
intensity overestimated wrt GsMAP (under
investigation)overestimation of total precipitation sum by AROME
and underestimation by COSMO general behavior of each model for
convective situations ?
different boundary layer states: COSMO warmer and moister than
AROMEday-to-day variability larger in COSMO (more clouds, higher
variations in turbulent fluxes)no clear explanation for differences
in precipitation amounts
Maurer et al.: Intercomparison of AROME and COSMO simulations
for a period of the AMMA campaign
25.06.2013
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IMK-TRO, KIT (Karlsruhe)16 Maurer et al.: Intercomparison of
AROME and COSMO simulations for a period of the AMMA campaign
25.06.2013
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IMK-TRO, KIT (Karlsruhe)17
zonal wind component at eastern boundary
25.06.2013 Maurer et al.: Intercomparison of AROME and COSMO
simulations for a period of the AMMA campaign
Foliennummer 1General comparison of model componentsGeneral
comparison of model componentsdifferences of total precipitable
wateranomaly of precipitable water with respect to 6-day period,
averaged over 12-20°Nprecipitation 5-day meanMCS tracking –
definition of “blobs”MCS tracking 25/07 and 26/07MCS tracking -
statisticsMCS tracking – statistics (2)boundary layer - vertical
profiles at 12 UTCdistribution of boundary-layer heightscomparison
of boundary-layer characterisicssurface layer – humidity and
potential temperatureConclusionsFoliennummer 16zonal wind component
at eastern boundary
